Analytical modeling for colloid-facilitated transport of N-member radionuclides chains in the fractured rock

Analytical modeling for colloid-facilitated transport of N-member radionuclides chains in the fractured rock 1 first-author 2 corresp Corresponding author. E-mail: imecpj@ccu.edu.tw Corresponding author. E-mail: imecpj@ccu.edu.tw imecpj@ccu.edu.tw Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 310, Taiwan Energy and Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 310, Taiwan Department of Mechanical Engineering, National Chung Cheng University, Chia Yi 62102, Taiwan Department of Mechanical Engineering, National Chung Cheng University, Chia Yi 62102, Taiwan A previous analytical model for N-member radionuclide decay chains has been extended to include the effect of radionuclide sorption with groundwater colloids. Published distribution coefficients were employed in the nuclide decay chain to illustrate the present model. The colloid concentration was assumed constant in time and space owing to equilibrium between colloid generation and sedimentation by chemical and/or physical perturbations. Furthermore, the diffusion of colloids into the rock matrix was ignored because the diameter of colloid is relatively large and colloids and fracture surfaces are like-charged. The results indicated that colloids could facilitate the transport of radionuclides and the large adsorbability of nuclides with colloids enlarged the effect of acceleration by colloids. The influence of colloids on the radionuclide transport was expected to be crucial to the actinides with large adsorbability; however, the present results revealed that the low-adsorbing nuclides whose parent nuclides have large capability of sorption could be also facilitated significantly by colloids indirectly. 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